Dental flask



J. A. AND u. s. GARDNER.

DENTAL FLASK.

APPLICATION msn MAR. 24. 1921.

r 1,414,566, Fatemi May 2,1922.

vso

. r. STATEsf-PATENT OFFICE.

JOSEPH A. GARDNER AND DAVID S. GARDNER, OF MMPHIS, TENNESSEE.

DENTAL FLASK.

'To all whom it may Concern:

Be it known that we, JOsEPH A. GARDNER and DAVID S. GARDNER, bothcitizens of the United States, residing at Memphis, in the county ofShelby and State of Tennessee, have invented certain new and usefulmprovements in Dental Flasks, of which the following is a full, clear,and exact description, which will enable others skilled in thel art tomake and use the same.

This invention relates to improvements in casting appliances, andconsists more particularly in improvements in the flask and crucible orladle holder for holding the investment material, or lmaterial of whichthe mold and melting Crucible or ladle are made. It particularly relatesto a flask having an integral crucible, or ladle, holder whereby theCrucible and mold may be formed in one piece withoutjoint through whichthe metal might escape in passing from the crucible to the mold. j

, The improved flask and crucible holder containing the combined moldand crucible constructed as hereinafter set forth is especially designedfor use in a centrifugal casting machine in which machines the mold andcrucible are placed on an arm adapted to revolve about a pivot, thecrucible being placed nearer the pivot and the material containedtherein being thrown by centrifugal force from the crucible into themold. The means for, and method of forming, the mold and crucible in thesaid flask and Vladle holder are fully described and shown in our PatentNo. 1,195,802 issued August 22nd, 1916, to

, be made in one piece especially for forming dental, jewelers, or othersmall Castings more particularly of precious metals in which 1t isessential that even the smallest loss of the precious metal beprevented; to' provide,l sec-y vshape of the device.

Specification of Letters Patent. Patented May 2, 1922, Application ineaMarch 24, 1921'. `sensu No. 455,085. Y

and securely attached to theiarm of the centrifugal machine, this beinga very essential With these objects in view, the inventionr consists inthe novel details of construction and combination of parts more fullylhereinafter disclosed in the drawings, specihcations', and claims.

In the drawings: Fig. 1 is a perspective view of the improved flask andcrucible holder ;k

Fig. 2 is a plan view of the same "showing the crucible as formedtherein.

. Fig. 3 is a section on the Center line, showing the liask and crucibleholder with the crucible and mold therein also in section.

Fig. 4 is a perspective view of a modified Referring now to the drawingsin which the various parts are indicated by the same numerals in all theviews, 1 is the crucible holder, 2 is the flask integral with thecrucithin metal of the length of the combined crucible holder andvflaskand cutting away approximately'onel half of the same for the length ofvthe crucible holder. 3, is a lug or extension from, the lower edge ofthe crucible holder 1 by means of which the same may be quickly clampedor secured to the arm of the centrifugal machine. It will be noted thatboth ends of the flask are open and that the end of the crucible isopen, but that it may be closed either partly or wholly if desired. 4 isan'eXtension member for the flask 2 which in the preferred form is ametal tube adapted to fit over the flask 2 and to slide in or outthereon to adjust the length of the flask. 5 is a clamping screw, beinga means to fasten the extension in they desired position. 6 is thecrucible formed -in the investment material 7, 8 is a mold also formedtherein and 9 a channel or sprue leading from the crucible to the mold.The crucible is made by means of a solid pattern of-metal, wood, orother material shaped to the desired form of the crucible 6.' In one endof the l pattern, a pin is placed to form the sprue 9 and on the end ofthis pin a WaX pattern of the desired casting is placed to form the mold8. If the lwax pattern is small, the eX- tensione1 is brought even withthe end of the Y to a molten condition, the machine is setin Vflask2iflonger as shown theextensionflC is brought out until sufficientlybeyondthe pattern and is then clamped in place by means of the set screw5. Ordinarily in filling the flask and crucible holder the extension enda is placed at the top and the flask and Crucible filled from that end,a suitable holder being asedto hold the patterns and flaskduring thefilling with investment or mold material.

lVhen the investment material has set or.

l hardened, the crucible Vpattern is removed and the `pin withdrawn fromthe sprue 9.

The wax pattern is then removed by heating,

"and the flask and Crucible holder containing the combined Crucible and-Vmold. is then placed on the arm of the castingmachine and attachedthereto, the precious metal is placed in the crucible 6 and heated bythe application of a blowpipe or otherintense flame and when the metalhas .been reduced motion and the metal kthrown by centrifugal e forceinto the mold.

It will readily be seen that the amount of investment material that mustbe heated in removing the wax mold and that must be kept hot whenreducing the metal is an importantfactor in quick and economical workand that an important .and valuable result` has been accomplished infurnishing the adjusting means whereby the amount of material needed canbe properly and easilyv regu:

lated.. It will also be noted that lit is advantageous to melt out thewax ,pattern be 'fore placing thel mold and Crucible holder Y on thecasting machine and that the lug for attaching the'same is of greatimportance because of the quickness with which the stood .that the crosssection of the crucible i holder,'the flask, and thel extension may berectangular, oval or such other shape as may be most satisfactory. ltwill also be dis-V tinctly understood that the extension l may telescopewithin instead of outsidethe flask and that the clampingmeans shownv istypical only, and maybe varied from the form shown. A flask, 2a, ladle,la, and extension, Lla, of .rectangular cross Section is shown 1n vaving now fully describedour invention,

what we claim and desire to secure by Letters Patent of the UnitedStates isz*-n l. A casting appliance comprising anopen top crucibleholder, an enclosed flask with open ends integral therewith, `.anextension for the said flask open at both ends and means of clamping thesaid extension.

"2. A casting appliance comprising an open top'V Crucible holder, anenclosed .flask with open endsrintegral therewith, an extension for thesaid flask, open at both ends,means for clamping the said extension inany de,- sired position relative tothe said flask and a lug extendingfrom thebottom of theV said V.

ladle holder.

3. A'casting` appliance having a Crucible 1 holder -with a bottom andsides, a flask having sides Vand bottom integral with the sides and.bottom of the said crucible holder, and a top, and an extension havingtop, sides and bottom corresponding with thetoprsides,`

and ybottom ofthe said flask and adapted to increase the length thereof,and means for clamping the said extensionin any Yposition on'thesaid'flask. f. Y

ll. A casting appliancev comprising a'semir('iylindrical crucibleholder, an integrali cylindesired drical flask, a4 slidably mountedcylindrical extension, means vfor, clamping the said eX- tension 1nany-'desired position and an in- Crucible holder, vflask and extension.

5. A castingapplian'ce comprisingasemicylindrical Crucible holder, anintegral cylindrical flask, aslidably'y mounted cylindrical.tegralcrucible and mold "formed in the said extension, a screwforiclamping the said eX: .Y

tension in any desired `position,1and an in- -tegral CrucibleV and moldformed 1n the said Crucible holder,flask and extension.

v 6. A casting appliance hav'ng a 'Crucible holder with a bot-tom andsides, Ya `flask ha-v- Y ing sides and bottom, integral with thesidesAand bottomof the said crucible holder, V,and

atop, an extension having atop, sides anda vbottom coordinating with thetop, sides and bottom of the said flask and adapted to' increase thelength thereof,-means .for'clamp ing the said extension in any desiredposi-V tion 011 the said flask, and an integral crucible andv moldformed inthe said `Crucible holder, flask and extension. A

In testimony whereof 'we have Ahereunto set our names. f jf JOSEPHl A.GARDNER l DAVID S.' GARDNER.V f

l/Vitne'sses: i

A l J. D. lMolMlURRY,V

H. M.VYHE ISIKELL. Y

